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dc.contributor.advisorGebhardt, Karlen
dc.creatorForestell, Amy Doveen
dc.date.accessioned2009-10-23T16:31:12Zen
dc.date.available2009-10-23T16:31:12Zen
dc.date.issued2009-08en
dc.identifier.urihttp://hdl.handle.net/2152/6641en
dc.descriptiontexten
dc.description.abstractDark matter is now accepted as an integral part of our universe, and galaxy dynamics have long provided the most convincing observational evidence for dark matter. Spiral galaxies have traditionally been used for these studies because of their more simple kinematics, however elliptical galaxies need to be understood as well. In this dissertation I present deep long-slit spectroscopy from the University of Texas’ Hobby-Eberly Telescope for a sample of elliptical galaxies. For a subsample of galaxies I fit axisymmetric orbit-superposition models with a range of dark halo density profiles. I find that all three galaxies modeled require a significant dark halo to explain their motions. However, the shape of the dark halo is not the expected NFW profile, but rather a profile with a flat central slope. I also discuss the galaxy masses, anisotropies, and stellar mass-to-light ratios.en
dc.format.mediumelectronicen
dc.language.isoengen
dc.rightsCopyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en
dc.subjectDark matteren
dc.subjectElliptical galaxiesen
dc.subjectDeep long-slit spectroscopyen
dc.subjectDark halosen
dc.subjectHobby-Eberly telescopeen
dc.subjectAxisymmetric orbit-superposition modelsen
dc.subjectGalaxy massesen
dc.subjectAnisotropiesen
dc.subjectStellar mass-to-light ratiosen
dc.titleExploring the dynamics and dark halos of elliptical galaxies at large radiien
dc.description.departmentAstronomyen
thesis.degree.departmentAstronomyen
thesis.degree.disciplineAstronomyen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen


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